From: Kumar Kartikeya Dwivedi <memxor@gmail.com>
To: bpf@vger.kernel.org
Cc: Alexei Starovoitov <ast@kernel.org>,
Andrii Nakryiko <andrii@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Martin KaFai Lau <martin.lau@kernel.org>,
Eduard Zingerman <eddyz87@gmail.com>, Tejun Heo <tj@kernel.org>,
Dan Schatzberg <dschatzberg@meta.com>,
kkd@meta.com, kernel-team@meta.com
Subject: [PATCH bpf-next v4 2/7] bpf: Enable unaligned accesses for syscall ctx
Date: Wed, 1 Apr 2026 14:28:11 +0200 [thread overview]
Message-ID: <20260401122818.2240807-3-memxor@gmail.com> (raw)
In-Reply-To: <20260401122818.2240807-1-memxor@gmail.com>
Don't reject usage of fixed unaligned offsets for syscall ctx. Tests
will be added in later commits. Unaligned offsets already work for
variable offsets.
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
---
kernel/bpf/syscall.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 51ade3cde8bb..f06fe9a9b1d3 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -6348,8 +6348,7 @@ static bool syscall_prog_is_valid_access(int off, int size,
{
if (off < 0 || off >= U16_MAX)
return false;
- if (off % size != 0)
- return false;
+ /* No alignment requirements for syscall ctx accesses. */
return true;
}
--
2.52.0
next prev parent reply other threads:[~2026-04-01 12:28 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-01 12:28 [PATCH bpf-next v4 0/7] Allow variable offsets for syscall PTR_TO_CTX Kumar Kartikeya Dwivedi
2026-04-01 12:28 ` [PATCH bpf-next v4 1/7] bpf: Support " Kumar Kartikeya Dwivedi
2026-04-01 12:40 ` Kumar Kartikeya Dwivedi
2026-04-01 12:28 ` Kumar Kartikeya Dwivedi [this message]
2026-04-06 1:11 ` [PATCH bpf-next v4 2/7] bpf: Enable unaligned accesses for syscall ctx Emil Tsalapatis
2026-04-01 12:28 ` [PATCH bpf-next v4 3/7] selftests/bpf: Convert ctx tests from ASM to C Kumar Kartikeya Dwivedi
2026-04-06 1:20 ` Emil Tsalapatis
2026-04-01 12:28 ` [PATCH bpf-next v4 4/7] selftests/bpf: Add syscall ctx variable offset tests Kumar Kartikeya Dwivedi
2026-04-01 12:28 ` [PATCH bpf-next v4 5/7] selftests/bpf: Test modified syscall ctx for ARG_PTR_TO_CTX Kumar Kartikeya Dwivedi
2026-04-01 12:28 ` [PATCH bpf-next v4 6/7] selftests/bpf: Add tests for unaligned syscall ctx accesses Kumar Kartikeya Dwivedi
2026-04-06 2:00 ` Emil Tsalapatis
2026-04-01 12:28 ` [PATCH bpf-next v4 7/7] selftests/bpf: Add tests for syscall ctx accesses beyond U16_MAX Kumar Kartikeya Dwivedi
2026-04-06 2:02 ` Emil Tsalapatis
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